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Galaxy S4 network problems finding 3g signal?

Hi I recently bought a Samsung Galaxy S4 and I'm having problems with the network. For some reason it will not find a 3g network. for example. It will work if I put in a Vodafone SIM or Giffgaff etc but will only connect to a 2g signal only. if I try put in a 3 SIM card which runs on 3g it will not find the network. Can you help?. I have tried: Resetting device. upgrading to lolipop and downgrading back to Kitkat. various fixes off the web. I think it was caused by: No idea.

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